Travel companies are falling over themselves to claim how green and responsible they are, but who can you trust and what are the main issues? To mark the launch of the Guardian's Green Travel List 2011, Richard Hammond, founder of Greentraveller.co.uk, will answer your questions live between 1-2pm on Tuesday 23 November. Post your question in advance and join Richard Hammond for expert advice on making your next holiday a greener one.

Nominate a green initiative for the Guardian Green Travel List

The Guardian's Green Travel List is a guide to companies worldwide that have shown evidence of commitment to community, place and the environment. If you've been inspired by a company, project, organisation or eco initiative, we'd love to hear about it. We're particularly looking for innovative projects, such as hotels that provide their own renewable energy, visitor centres and attractions that have significantly cut their carbon emissions, low emissions transport initiatives, and authentic community projects worldwide that genuinely give back to the local people and the destination.